A cone has a base radius of 8cm and height 11cm. calculate , correct to 2d.p, the curved surface area

  • A 341.98cm\(^2\)
  • B 276.57cm\(^2\)
  • C 201.14cm\(^2\)
  • D 477.71cm\(^2\)
waec 2021mathematics

The correct answer is A. 341.98cm\(^2\)

Where l\(^2\) = h\(^2\) + r\(^2\)

l\(^2\) = 11\(^2\) + 8\(^2\)

l = âˆš185

l = 13.60cm

The formula of CSA of Cone is Ï€rl

\(\frac{22}{7}\) * 8 * 13.60

= 341.979 or 341.98 (2d.p)

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